SEISMIC RESPONSE AND GENETIC MECHANISM OF THE SUBMARINE LANDSLIDES IN SHENHU AREA, SOUTH CHINA SEA
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摘要: 海底滑坡广泛发育于海底陆坡上,是改变海底地形地貌的主导因素,也是大陆坡上沉积物往深海盆地搬运的重要方式。利用神狐海域针对水合物储集层做过特殊处理的高分辨率地震资料,首先根据剖面的地震响应特征对该区域海底滑坡的后壁、侧壁以及滑坡内部构造进行识别、分析和解释,其次根据海底及海底以下不同反射时间的时间切片对该区域海底滑坡的整体形态以及空间展布等特征进行了详细刻画。最后结合流体聚集区频谱分析结果以及滑坡分布与流体活动带的对应关系,分析了该区域海底滑坡与流体活动的相关性,推断了该区域海底滑坡的直接诱因。Abstract: Submarine landslide always happens on the continental slope. It is one of the leading factors to change the landform of the seabed and the important way to transport the sediment from the continent to the deep-sea basin. To study the hydrate reservoir in the Shenhu Area, northern South China Sea,3-D seismic data gathered in this area are processed with special methods. The headwall scarps, side scarps and the internal structure of submarine landslides are interpreted based on the characteristics of the seismic responses in the seismic profiles; the shape and the extending pattern of the submarine landslides are interpreted based on the time slices of different reflection interval. Based on the results of the spectral analysis of the fluid medium accumulation area and the correspondence between the submarine landslides and the fluid medium accumulation area, the relationship between the genetic mechanism of the submarine landslides and the fluid medium in this area is interpreted and defined.
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Key words:
- submarine landslides /
- 3-D seismic data /
- genetic mechanism /
- fluid medium /
- South China Sea
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